Traded from Kansas City in the offseason as part of the James Shields deal, Myers was billed by many as the top hitting prospect in all of baseball. When Myers was called up it even sent Dick Vitale into a Twitter tizzy. Myers has been a positive addition to the Tampa Bay lineup, adding a powerful right-handed bat to the middle of the order. His first homer? A grand slam at Yankee Stadium against CC Sabathia. Not too bad. His Triple-A numbers at Durham before the call-up: 63 G, .283 BA, 14 HR, 57 RBI, .868 OPS.

Gyorko did not have the eye-opening start of Gattis or Puig, but after a slow first month, Gyorko reaped the benefits of a team building for the future and willing to wait for a prospect to break out. He landed on the DL on June 10 with a groin strain, but still played in 125 games and put up solid power numbers with 23 HR.

Another high pick, Fernandez was taken 14th overall in the 2011 draft at the age of 18. But despite his age, he was in the Miami rotation on Opening Day, making his debut in his team's sixth game. While he struggled to find consistency in the early going, Fernandez was a revelation in the second half of the season, putting up ridiculous numbers after the All-Star break. Fernandez went 7-1 with a 1.32 ERA, 0.82 WHIP, and 84 SO over 68 innings.

For all the talk of the Dodgers' big-money roster and boom-or-bust mentality entering the season, they are the only team with a hitter and a pitcher on this list. And Ryu, while no ordinary rookie at 26-years-old, has been on the roster since Day One. Clayton Kershaw is the undisputed ace of the staff, but thanks to injuries, trades and inconsistencies, Ryu established himself as quite the reliable No. 3 man. Oh yeah, he hangs out with Psy, too.

The first pick of the 2011 Draft out of UCLA, Cole has been facing big expectations from the start. And he didn't disappoint. The SoCal native outdueled Tim Lincecum in his big-league debut to take down the reigning champs, and followed that up by becoming the go-to guy in the Pirates roation come postseason. How cool is this guy? Not only did he get Giants shortstop Brandon Crawford out in their first two meetings, but he also dates Crawford's sister. Scoreboard — and scoreboard!

Little more than 50 games into his major league career and Gattis already has a legend that dwarfs his 6-foot-4, 230-pound stature. But that's not to say the man already nicknamed El Oso Blanco isn't pulling off some mighty feats on the baseball field, too. The 26-year-old who quit baseball once to work in a pizza parlor and later as a janitor, exploded onto the scene with a home run off Roy Halladay in his second big league at-bat on Opening Day.

No player has taken the MLB by storm this season like Puig. After his amazing June, he became the first player to win both Rookie and Player of the Month awards in his debut month. His first career game ended with him throwing a runner out at first base from right field to complete a game-ending double play. Playing in Southern California for one of baseball's signature franchises, he's proven to be a hit both on the field and off it, tying an MLB record with 10 RBI in his first five career games and smashing the Dodgers record for merchandise sold in a four-day span — for any player. Ever.

It's been nearly 20 years since the Holy Trinity of shortstops put the baseball world on its ear. But despite all of their greatness, the trio of (from left) Alex Rodriguez, Derek Jeter and Nomar Garciaparra needed three seasons to take the MLB by storm (Rodriguez debuted in 1994, Jeter in '95 and Nomar in '96). In less than three full months, the crop of phenoms to make their MLB debut in 2013 have already shown signs that we could be seeing a once-in-a-generation single-season influx. To qualify for this list, players must not just be a rookie, but have not played in the MLB prior to this season (sorry, Shelby Miller). So who’s laying down the foundation of a career headed for Cooperstown? Click ahead.

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